The fight against Drill-Horn and Robo Knight.Robo Knight sacrificing himself to save Orion.
The final fight against Vrak,which ends with the Rangers using the Infinite Sky Strike to finish him off for Good.
http://tvtropes.org/pmwiki/pmwiki.php/Awesome/PowerRangersSuperMegaforceS2EP17VrakIsBackPart2
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The fight against Drill-Horn and Robo Knight.Robo Knight sacrificing himself to save Orion.
The final fight against Vrak,which ends with the Rangers using the Infinite Sky Strike to finish him off for Good.